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6.1

Firefox may mishandle <noscript> tags, allowing scripts

published 5 days ago
Summary

Firefox’s built‑in tool for reading HTML (the DOMParser) does not correctly escape content inside <noscript> tags. This could let unwanted code be treated as normal content, potentially leading to unexpected behavior on web pages. Update Firefox to the latest version to get the fix.

What to do
  • Update cleanstart firefox to version 87.0-r0.
Affected software
Ecosystem VendorProductAffected versions
CleanStart cleanstart firefox < 87.0-r0
Fix: upgrade to 87.0-r0
Original advisory text
DOMParser API did not properly process '<noscript>' elements for escaping
Security vulnerability affects the firefox package. The DOMParser API did not properly process '<noscript>' elements for escaping.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
6.1 Medium
Timeline
Published30 Oct 2026
Updated31 Oct 2026
First seen31 Oct 2026
Sources
CLEANSTART-2024-YU37999 · OSV
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